The city of Berlin suffered continuous aerial bombardment by the American and British air forces. To defend the city from Allied bombing, the Nazi authorities erected three large Flakturm in three different districts of Berlin:Humboldthain, Zoo and Friedrichshain.
Of the three anti-aircraft towers in the city, only one remains standing, since the other two were demolished by the occupiers after the Second World War. The Humboldthain tower, completed in 1492, is still standing despite repeated attempts to blow it up and make it disappear. The tower was 75 meters on a side and 39 meters high. The maximum thickness of the roof was 5 meters.
The tower was demolished in its southern half, becoming a mountain of rubble which is part of the Humboldthain public park. The northern part remained standing and is accessible today for free. The interior of the building can only be visited with a guide. The visits are carried out by the Berliner Unterwelten Foundation.
How to get to the Humboldthain anti-aircraft bunker
The remains of the Humboldthain Flakturm are today in a public park. The nearest station is Gesundbrunnen/Nordkreuz which can be reached by the S-bahn lines S1, S2, S26, S41 or S42 or the metro line U8. To know the best combination to arrive you can consult the following LINK.